Atlanta Journal-Constitution: With a tight new cap freshly installed on its leaking well in the Gulf of Mexico, BP planned gradual tests starting Tuesday to see if the device can stop oil from pouring into the sea for the first time in nearly three months. The cap would be just a temporary solution, but it offers the best hope yet for cutting off the crude that has fouled the Gulf since the Deepwater Horizon rig leased by BP exploded April 20, killing 11 workers.